Electric control for hangar telescopic canopy doors



Jan. 29, 1952 F. D. NOBLE 2,583,662

ELECTRIC CONTROL FOR HANGAR TELESCOPIC CANOPY DOORS Filed July 26, 19453 Sheets-Sheet l l J l rr- 14 v F LL Jan. 29, 1952 F D. NOBLE 2,583,662

ELECTRIC CONTROL FOR HANGAR TELESCOPIC CANOPY DOORS Filed July 26, 19453 Sheets-Sheet 2 Jan. 29, 1952 F. D. NOBLE ,6

ELECTRIC CONTROL FOR HANGAR TELESCOPIC CANOPY DOORS Filed July 26, 19455 Sheets-Sheet 5 "'L! -L'L f p 6?. A Ln,

2% 514-16 -20 7\ Ov r+ravel L l l 2,3 q Ir I i SWl+Ch LTmH- Swii-ch esINVENTOR F. D. NOBLE ww hg Patented Jan. 29, 1952 UNITED ELECTRICCONTROL FOR HANGAR- TELESCOPIC CANOPY DOORS Francis D. Noble, Toronto,Ontario, Canada Application July 26, 1945, Serial No. 607,170

' 4 Claims.

This invention relates to improvements in electrical control devices forthe raising and lowering mechanism for telescopic hangar doors and theprincipal objects of the invention are to provide a control which willeliminate the possibility of damage to the doors or planes which mightbe under them through careless manipulation or through failure of themain operating switch to cut the motor circuit at the required period.

The principal features of the invention consist in the novel arrangementof electrical circuits and controls whereby limit switches are providedto cut the motor circuit and apply a brake when the door reaches itsmaximum open or closed position or in the event of the motor operatingto over or underwind the cables for operating the doors if the limitswitches controlled by the movement of the doors fail to operate.

A further important feature of the invention consists in the novelarrangement of circuits and manually controlled switches for startingand stopping the operating motor associated with the aforesaid limitswitches.

In the accompanying drawings Figure 1 is a diagrammatic side elevationalillustration of a telescopic hangar door to which my improved controlequipment is applied.

Figure 2 is a diagrammatic elevational view of the door and its raisingand lowering equipment as seen from the inward side.

Figure 3 is a plan view of the motor and cable winding mechanism.

Figure 4 is a wiring diagram of the control equipment.

Referring to the accompanying drawings, in the frame construction of thehangar the overhead arch beam l of the door opening is connected withparallel inwardly extending beams 2 from which are supported the mainpivots 3 which support the swinging upper door section 4 mid-way of itsheight.

Cable drums 5 are suitably supported in an overhead frame structure 6above the door beam I, over which the cables l which support the lowertelescopic door section 8 which is slidably mounted between the sidebeams of the main door section 4.

A cross frame structure 9 is mounted on the parallel beams 2 and on thisis mounted on suitable journals a shaft I0 carrying the cable drums l lto which the cables I are secured.

Guide drums or sheaves I! are mounted below the frame 9 and the cablesextending from the upper drum 5, pass under these guide drums and extendupward to the shaft drums.

Curved trackways l3 are mounted in the overhead frame to engage rollersmounted on the lower telescopic door section 8 when said section i movedto its raised position and these trackways swing the whole doorstructure on its pivots 3.

The building frame and door structure is of usual construction and thedetails of construction are not shown as they do not form a part of thepresent invention.

Arranged upon the main door section 4 in a suitable position is a limitswitch It of any suitable design which is engaged by a suitable contactmember 15 on the lower or slidable door section 8 so that the switchwill be operated to cut the electric circuit to which it is connected asthe door 1 reaches the lower limit of its travel.

A similar limit switch I5 is arranged on the cross frame 9 and isengaged by the upper part of the door when it swings on its pivots tothe horizontal full open positions to out the electric circuit.

Connected to the shaft I0 is a suitable form of over and underwind limitswitch It such as the General Electric geared-type limit switch CR9441-LS424 which will out the electric circuits to which it is connectedwhen the shaft l0 rotates a predetermined number of revolutions eitherforward or backward.

The shaft I0 is operatively connected by a suitable gear I! to thereversible motor l8 and the motor shaft is controlled by a suitable formof solenoid operated brake 49.

Referring particularly to the wiring diagram Figure 4, a magneticcontactor A provided with switch contacts 20 is connected with the powerlines P through suitable main switches P connected in lines L1, L2, L3.The contact operating solenoid 2| is connected across one phase L1, L:of the power source by the leads 22 and 22, and in series with thissolenoid is the normally closedover and underwind limit switch I6, and asuitable form of manual foot-operated switch 23.

Connected in series with the contactor A through line switches L1, L2,L3 is a magnetically operated reversing switch B which controls thereversible motor 18. Switch B is provided with switch members 24, 25 and26 operated by solenoid 21, and with switch members 3|. 32 and 33operated by solenoid 34., The line side of switch member 24 is connectedto one side of switch 3|, similarly the line side of switch mem ber 25is connected to one side of switch member 32, and the line side ofswitch member 26 is connected to one side of switch member 33. The freeor motor side of switch member 24 is connected to the free or motor sideof switch member 32 by the lead 35 which is connected to one terminal ofthe motor by the lead 28. Similarly the motor sides of switch members 25and 3| are connected in parallel by the lead 36 and are connected to thesecond terminal of the motor by the lead 29. Also the motor sides ofswitch members 26 and 33 are connected in parallel by lead 31 and to thethird terminal of the motor by lead 30.

In the event that switch members 24, 25 and 26 are closed it will beseen that the phase sequence to the motor will be, for example L1, L2,L3, whereas if switch members 3|, 32 and 33 are closed the correspondingphase sequence will be L2, Ll, Lo and the rotation of the motor fieldvector will be reversed.

The solenoids 21 and 34 are connected in parallel with leads 38 and 48connected with lines La and L1 respectively. The normal supply circuitto solenoid 21 when it is energized is from the distributor head 39,connected with lead 38, through lead 4|, limit switch l, lead 38 back todistributor lead 39, through lead 4! and contact 21'. Leads 41 and 48complete the return circuit.

Contact 21' is held closed only by the energized solenoid 21, andtherefore a separate circuit comprising push-button 42 and lead 40connected to lead 40 through distributor head 39 is provided in parallelwith limit switch and contact 27 to initially energize this solenoid.

Similarly solenoid 34 is normally energized through lead 44', limitswitch i4, lead 38' and 43 and contact 34' which is held closed by theenergized solenoid. In parallel with the limit switch l4 and the contact34 is the initial energizing circuit comprising push button 45, leads v43 and 44'.

A suitable normally closed push button stop switch 46 is inserted inline 38'.

In the operation of this control system the foot switch 23, which isnormally open, when closed energizes the circuit of the contactor A andsupplies power to the reversing switch B which is the main motorcontrol.

Upon the operation of the push button 42 the motor circuit is closedthrough the switch members 24, and 26 to operate same to open the doorand if the door operates the limit switch 15 the circuit is broken and asolenoid brake 49 operates to stop the motor.

To close the door the push button is operated to energize the solenoid34 thereby closing the motor circuit through the switch members 3 i, 32and 33 thus reversing the phase sequence to cause the motor to operateto unwind the cables "I to lower the door and if the controls are notnormally operated before the door reaches its closing limit, the limitswitch [4 is operated to break the circuit and cause the motor to bearrested by the solenoid brake 49.

It will also be seen that in the event of the manual controls not beingoperated at the proper time and if for any reason the limit switches itor l5 fail to function the over and under run ning switch [6 connectedwith the cable operat ing shaft will function to break the power circuitthrough the magnetic contactor A which retains its switches closed onlywhen the circuit to its operating solenoid is closed.

The control device thus has a double automatic safety control inthearrangement of the limit switches 14 and i5 and the over and underwinding switch l6 and it is also capable of manual control to be stoppedby the operation of the push button 46 in the power lead 38'.

Suitable thermal overload devices are arranged in the contactor A andreversing switch B.

What I claim as my invention is:

1. Electric control means for controlling the operation of a hangar doorcomprising a threephase electrical power source and a reversibleelectric motor connected with said power source and having an outputshaft adapted to be operatively connected with the door to open the doorwhen energized to rotate in one direction and to close the door whenenergized to rotate in the reverse direction, a magnetically operatedmultiple contact reversing switch including a magnetic control circuitin series with said motor source for reversing the phase to said motor,limit switches arranged in the magnetic circuit of said reversing switchto open contacts of said switch as the door approaches its operablelimits to deenergize said motor, and a geared-type limit switchconnected with theshaft of said motor and electrically connected in saidpower supply circuit connected with said reversing switch to interruptcurrent flow to said reversing switch and magnetic control circuit tostop said motor upon a predetermined number of revolutions of the motorshaft in either direction in the event of failure of the aforesaid limitswitches or the contacts of said reversing switch to open upon the doorreaching the limits of its movement.

2. Electric control means for controlling the operation of a hangar doorcomprising a threephase reversible motor operatively connected with thedoor to open the door when energized to rotate in one direction and toclose the door when energized to rotate in the reverse direction, athree-phase supply circuit for said motor, a multiple contactphase-reversing switch connected in the supply circuit of said motor,solenoids connected in said supply circuit to operate the contacts ofsaid reversing switch to control the direction of rotation of saidmotor, manually operable switch means for controlling said solenoids,limit switches connected in series with said solenoids and arranged tobe opened by said door reach ing the limits of its movement to releasethe contacts of said reversing switch to de-energize said motor, and anover and underwind limit master control switch geared to said motor andconnected to open said supply circuit to said phasereversing switch tode-energize said motor and solenoids independent of the position of saidphase-reversing switch contacts upon rotation of said motor beyond apredetermined number of revolutions in either direction in event theaforesaid limit switches or the contacts of said reversing switch failto open upon the door reaching the limits of its movement in eitherdirection.

3. A control as claimed in claim 2 in which a magnetically operatedswitch is included in said supply circuit on the supply side of saidreversing switch, and a solenoid is arranged to operate saidmagnetically operated switch, said over and underwind limit switch beingconnected to operate said last-mentioned solenoid.

4. Electric control means for controlling the operation of a hangar doorcomprising a. threephase power source and a three-phase reversibleelectric motor having an output shaft adapted to be operativelyconnected with the door to open the door when energized to rotate in onedirection and to close the door when energized to rotate in the reversedirection, a normally closed magnetic switch connected between saidsource and said motor, a. multiple contact reversing switch connected inseries with said magnetic switch and said motor, a pair of solenoidsenergized from said power source one to close contacts on said reversingswitch to give a phase sequence connected to said motor to rotate saidmotor in one direction, the other to close contacts on said reversingswitch to give a phase sequence connected to said motor to rotate saidmotor in the reverse direction, manual switch means connected in serieswith said solenoids to operate the contacts of said reversible switch,limit switches connected in series with said solenoids one to open thecontacts of said reversing switch as said door approaches the limits ofits opening movement the other to open the contacts of said reversingswitch as said door approaches the limits of its closing movement, and agear type limit master control switch connected with the shaft of saidmotor to open said normally closed magnetic switch to interrupt power tosaid phasereversing switch and said pair of solenoids to deenergize saidmotor upon a predetermined numher of revolutions of the motor shaft ineither direction in event of failure of the aforesaid limit switches orthe contacts of said reversing switch to open upon the door reaching thelimits of its opening or closing movement.

FRANCIS D. NOBLE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,210,680 Otis Jan. 2, 19171,552,687 Fenster Sept. 8, 1925 1,632,237 Lemon June 14, 1927 1,745,990Goldman Feb. 4, 1930 1,760,062 Hynes May 27, 1930 1,872,175 Peele Aug.16, 1932 1,928,611 Bancroft Oct. 3, 1933 2,000,515 Gross May 7, 19352,034,415 Parvin Mar. 17, 1936 2,070,058 McCloud Feb. 9, 1937 2,168,152Brauchler Aug. 1, 1939 2,244,405 Schilling June 3, 1941

